EEPORT OX THE TE'XICATA. 
329 
circular or elliptical form marked by the distinct branchial and atrial apertures. Both 
apertures are more or less distinctly four-lobed. The bodies of the Ascidiozooids are 
shghtly elongated antero-posteriorly, and are about 6 or 7 mm. in length. They are 
placed vertically in the colony, and are not divided into regions. 
The Test is firm and cartilaginous. In sections it is whitish-grey with a slight 
hyaline tint, and is semi-transparent. The outer layer is much firmer and tougher and 
more opaque than the rest. The matrix is seen, when highly magnified, to be delicately 
fibrillated. No bladder cells are present. Vessels are well developed in the test, and 
especially in the peduncle. The vessels branch and anastomose freely, and terminate 
in ovate or irregular swollen bulbs. 
The Mantle is moderately strong. The muscle bands are delicate but numerous; 
they run in all directions. 
The Branchial Sac is large and well developed. There are three folds upon each 
side. Each fold has about four internal longitudinal bars upon each side, and there are 
two bars in the interspace. The meshes are elongated transversely, and contain each 
about three stigmata. The transverse vessels are very wide, and are all of about the 
same size. The stigmata are short and wide. Muscle fibres are present in some cases; 
they are usually in the transv^erse vessels. 
The Endostyle is large and conspicuous. Its course is straight. 
The Dorsal Lamina is a plain membrane with well marked ribs corresponding to the 
transverse vessels of the branchial sac, but with no marginal teeth or processes. 
The Tentacles are numerous and closely placed. There are about fifty, and they are 
of two sizes placed alternately. 
The Dorsal Tubercle is small and inconspicuous. It is placed on the ventral surface 
of the large dark neural gland. 
The Alimentary Caned is placed alongside the branchial sac. It is directed trans- 
versely. The stomach is ovate and has its wall longitudinally folded. The intestine 
is narrow, and forms a moderately wide loop. 
The Reproductive Organs are in the form of polycarps imbedded in the mantle, and 
projecting into the peribranchial cavity. Each poly carp is hermaphrodite. The ducts 
terminate on a prominent papilla. 
Locedity. — Simon’s Bay, Cape of Good Hope; depth, 10 to 20 fathoms. 
Two large specimens of this interesting species were dredged in Simon’s Bay at the 
South end of Africa, from a depth of 10 to 20 fathoms. They are irregularly discoid 
masses, which were probably attached in a vertical position, the short peduncle being a 
(ZOOL. CHALL. EXP. PART XXXVIII. 1886.) Pp 42 
